Energy-Dependent Chemical Potentials of Light Hadrons and Quarks Based on Transverse Momentum Spectra and Yield Ratios of Negative to Positive Particles

Figure 1

Transverse mass spectra for positive ( and ) and negative ( and ) particles produced in central Au-Au collisions at mid-rapidity over an energy range from 2.67 to 4.84 GeV. The experimental data represented by the symbols are measured by the E895 Collaboration [36] for at 2.67, 3.31, 3.81, and 4.28 GeV and the E866 and E917 Collaborations [37, 38] for at 3.31, 3.81, 4.28, and 4.84 GeV. The data at each energy are scaled by successive powers of 2 for clarity. The plotted error bars include both statistical and systematic uncertainties for and only statistical uncertainty for . The solid curves are our results calculated by using the two-component Erlang distribution.